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rs zscaiei Louis A, DE A'BovE, or LILLE, NOBD, FRANCE;

1 s-gsAou-ime THREADS AND F ABRl'Cs T- .SPECIFIGATIONformingm of Letters Patent no. 280,141, dated June 26, 383.

" 3 Application filed April 5, '1883. (No specimens.) Patented in France May 18,1881, Ito 142,899,- in England Augiist i881,

No.'3, 575; and in Belgium August 19, 1881, No. 55,502.

"To all whom) it may concern:

' -ZBe it known that I, LOUIS ALEXIS- DE'LA:

:BOVE, a citizen of the French Republic, and a -':;rsident of Lille, Prov. du N 0rd, France, have invented certain Improvements-in Processes "for BleachingFibersandFabrics of 'Flax and 'Hemp,'of'which the follbwing is a specifica- 3 Myin'vention has for its object the complete rw'oi dance 'of exposure on the-grass in the pro l' c'e'ssof bleaching fabrics and fibers of flax and hemp,'.and the perfect bleaching, by simple ig nieans, of such fibers and tissues, whatever [may-be their species or quality, and whether they are, unbleached or have before undergone someftreatment, chemicalor. otherwise.-

In carrying out my invention I first submit These two 11 1 substances in presence ofeach 7 other canse a eactiom and develop a decolorizing-power.

mlich 'greaterIthanthat 'of calcium hypochlowith the addition of an acid, and which almuch less injurionseffect on the fiber 'n equivalent quantity of the hypochlohe'chlorometrical standard of the hypochlorite employed will vary according as the atria is woven more :or less tightly, and as the fibers and threads are more or less coarse or moreor less chargedwith colorlng mate- ,rialthat is, according asthe material is more or less diflicult to bleach. In any case, how- 1 ever, there will be no danger in employing so lutions having a strength of 100. The qnantity of the aluminium sulphate saturated with aluminium hydrate employed will'be in a proportion equivalent to the qnan-' j tity'of the-calcium hypochlorite. A simple washing sufiices to eliminate the products of h the reaction that will have the material treated been deposited on with ammonia added, and then to give them :1

final decolorizing'bath, similartotlie first.

The advantage of myprocess willbe obvi ous to all who are familiar with the'present mode of bleaching by exposure to the air or:

the grass in conjunction with bleaching-pow- 1::

der. So far as I am awarethis process rarely produces a perfect white, the ordinary tint be dug yellowish, and to produce good resultsthe:

treatment "must be repeated, often. several times. This ofcourse places the bleacherat the mercy of the elements. Sometimes it is too dry and sometimes too cold. lnthe winter the grass is covered with snow. Then the damage done by gnawing rodents must be taken into account, Iaswell as the damages resulting from high winds. The atmosphere also precipitates matter on the material or fabric which necessitates the labor of washing it out. My methodavoids allofthesedifiioulties', and

in skilled hands may be relied onto produce Besides this, thebleac'her who employs my process will always know just how long it will take to accomplish;

uniformly good results.

the results, as the same causes may always be relied on to produce the same r "ults prac tically in the same time.

'The'here in-described process of bleaching,

which consists in treating fibers of flax and hemp, and, threads and fabrics made there- 7 from first with a bath or solution of calcium hypochlorite, and afterward with a solution of aluminium sulphate saturated with' alumin 'inm hydrate, substantially as described.

' In vitness whereof I have hereunto signed my name in the presence of .two subscribing witnesses. I

4 f LOUlS ALEXIS DELABov'E.

'lVitnesses: l

G. VANACKERO, A. GoBnR'rLE. 

